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受欢迎的代数 >

-x^3+15x^2-63x+49=0

解答

- x^{3} + 15 x^{2} - 63 x + 49 = 0

解答

x = 1, x = 7

求解步骤

- x^{3} + 15 x^{2} - 63 x + 49 = 0

因式分解

- x^{3} + 15 x^{2} - 63 x + 49 : - (x - 1) (x - 7)^{2}

- (x - 1) (x - 7)^{2} = 0

使用零因数法则： If

ab = 0

then

a = 0

or

b = 0

x - 1 = 0 or x - 7 = 0

解

x - 1 = 0 : x = 1

解

x - 7 = 0 : x = 7

解为

x = 1, x = 7

作图

流行的例子

h^{3} = 0.027

x^3-3x^2-4x+6=0

x^{3} - 3 x^{2} - 4 x + 6 = 0

3 y^{6} = 75 y^{4}

solvefor x,z=x^4-2y^3

so l v e f or x, z = x^{4} - 2 y^{3}

x^{3} = 888